Schedule Metrics
Schedule Performance Index (SPI)
SPI = earned value / plan value
Schedule Variance (SV)
SV = earned value – plan value
Schedule Variance (time)
SV(t)= Earned schedule – Actual time
Schedule Performance Index (time)
SPI(t)= Earned schedule / Actual time
Revised Estimated Duration
= Original planned duration / SPI(t)
Also used for target dates EVM 1 and EVM2
Cost Metrics
Cost Performance Index
CPI = earned value / COWD
Cost Variance
CV = earned value – COWD
Independent Estimate at
Completion
IEAC1=BAC/CPI
IEAC2=[(BAC-EV to date)/CPI 3 months]+COWD
IEAC3 = COWD + ((BAC – EV (cum)) / (CPI * SPI(t)))
IEAC4= COWD + ((BAC – EV (cum)) / (0.8CPI + 0.2SPI(t))
To complete performance measures
TCPI= Work remaining / Budget Remaining
TCPI (BAC-EV) / (AFC – COWD)
TSPI = Work to complete with authority / planned remaining budget within authority
TSPI – (Authority – EV ) / ( Authority – PV )
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